The Mitsui Seiki J350G jig grinder offers a combination of application flexibility, accuracy and operator-friendly operation. The machine provides a very large grinding infeed stroke, with a U-axis range of -3mm to +50mm relative to the spindle center. This provides the flexibility to grind small- and large-diameter holes, as well as multiple features, using a single wheel in a continuous, automatic mode.
To maximize accuracy, the X and Y axes of J350G are hand scraped and incorporate needle roller bearings. The machine bed consists of a thick, highly rigid casting supported by three level points, assuring consistent perpendicularity and parallelism. Built-in, custom-designed Heidenhain scales contribute to +/- 0.0007mm accuracy on the X, Y and Z axes.
Table longitudinal travel (X-axis) is 500mm, transverse travel (Y-axis) is 300mm and quill travel (Z-axis) is 100mm. Maximum distance from the table surface to the grinding spindle nose is 450mm. The machine’s work surface is 700mm x 350mm and permissible table load is 300kg.
Table and saddle maximum rapid feed rates are 2,000 mm/min. and grinding feed rates are variable from 0.1 mm/min. to 2,000 mm/min. The standard high-frequency spindle motor operates from 9,000 rpm to 45,000 rpm. A variety of spindle motor options include an air-turbine motor with 75,000-rpm capability.
The machine’s 3 sq. m (2,220mm x 2,610mm) footprint is 50 percent smaller than that of the previous model, maximizing floor space efficiency. A standard total enclosure machine cover permits easy operator access while fully addressing safety and environmental concerns.
The J350G’s FANUC 31i-B control has a 15" touch panel LCD screen and is preloaded with G-MAPS conversational-style programming software. The control also permits easy manual programming via graphic icons, data entry or conventional methods.
“The J350G jig grinder gives users the ability to grind a wide variety of features automatically, without changing wheels,” said Tom Dolan, Mitsui Seiki vice president of sales and marketing, “It thereby provides the flexibility required in today’s manufacturing environment.”
Related Glossary Terms
Rate of change of position of the tool as a whole, relative to the workpiece while cutting.
Machining operation in which material is removed from the workpiece by a powered abrasive wheel, stone, belt, paste, sheet, compound, slurry, etc. Takes various forms: surface grinding (creates flat and/or squared surfaces); cylindrical grinding (for external cylindrical and tapered shapes, fillets, undercuts, etc.); centerless grinding; chamfering; thread and form grinding; tool and cutter grinding; offhand grinding; lapping and polishing (grinding with extremely fine grits to create ultrasmooth surfaces); honing; and disc grinding.
Tooling usually considered to be a stationary apparatus. A jig assists in the assembly or manufacture of a part or device. It holds the workpiece while guiding the cutting tool with a bushing. A jig used in subassembly or final assembly might provide assembly aids such as alignments and adjustments. See fixture.
- jig grinder
Machine for grinding molds and dies where the positioning, shaping and finishing of holes and other surfaces are needed.